Method of vulcanizing rubber



a citizen of the United States, T'Ashland, county of Ashland, State of Or "have invented certainnew and useful,Im-. r provcments in Methods of Vulcanizing Rub- 1 bet (Case H), a specification. V

' My invention relates to the vulcanization l I ap uuuii aicu nc'vemm as, i

' all it may i .Be a known that nrsoiirs W. Main, residin 'at io,

of which the following of rubber, and the like, and has for its object to provide a superior vulcanized article of high tensile stren h and possessing good ag- 7 tion,

gum stock. Also,

ing properties. y improved method also produces when desired an article of natural rubber color and transparency, percent or more pure rubber, duces an article in colors, It possesses immunity from prevulcanizaand freesulphur is practically elimianalyzing 95 and also pro- 'nated from the vulcanized product. The

vulcanizing, process is characterized by extremesimplicity, and vulcanization can be second lished at or below a temperature of 212 in a'com aratively short time.

Before proceed out that in a rubber compound containing 'a metallic salt, preferably zinc oxide, in I limited quantities and subjected to the action of an amine and carbon disulphide, the

' zinc oxide will dissolve and the rubbercompound take on the appearance of a pure in the processes which follow, two difierent classes of accelerators, both old in the art, are employed, and which I will designate as accelerator A,'snch as tetra-alkvl-thiuram-disulphide, or the reactionproduct of carbon disulghide and an amine: and as accelerator" ethvlidine aniline, 'hexamethylenetetramine and others, which can-be milled freely without danger of prevulcanization; Either class the vulcanizalow temperatures and class 5 B at temperatures above 250"F.. butthe combined action of the two nill produce a. quicker vulcanization at lower temperatures than either one alone will accomplish inquantities employed in my processes.

In carrying out my improved processes, first prepare a rubber'compound which may consist of (1) rubber and a metallic oxide;

or compounded.

be milled and calendcred' ing with a description of my vulcanizing process, it is desired to point tions' aslwith the solution for-lcompound ,-such u r Y.

naptha, carbon disulphide and an] (2; rubber, oxide and sulphur-- (3 rubber, ,g iruetallicioxide, sulphur an. r class ,B accelerator; (4? rubber, a me F tallic oxide, clam A. acce orator and j Y B accelerator: While 160 not limit gnyself to the same, the following proportions have been found satisfactory: V

r 21; Rubber 98 parts, z inc oxide 2 parts. 2 Rubber 96 parts, zinc oxide 2 parts,- SUl(pl;11Ir{ 2b arts. d 2

3 u r.95% parts zincoxi 0 ports, sulphur 2 parts, class B accelerator part. l v y g (4) Rubber 97 parts, zinc oxide 2])!118, class A ecceleraiior ,4; part, class B 80- celerator part.

Either oi the four corn unds given my mthe usual manner, and if to be used for di goods, converted intoa rubber cement y the ad- ".51" dition of naptha or other solvents. V

The four compounds previously descri 1: f or articles made herefrorn, then are as follows: Y f

For compound (DI-prepare a solution of. naptha, carbon disulphide, sulphur, accelerator A and-accelerator B the folloyw ing proportions have been found ;sa.t1s-, factory; naptha 65 percent by volume, carv bon disul hide-35 percent by volume, to T which I a d 2% ounces sulphur, 1% ounces accelerator A, and 1 ounce accelerator if B to each gallon of naptha and carbon, .4 disulphide For compound (33 1 naptha, carbon di ph and, accelerator A prepare a. solution of r ide, accelerator B in the same proper- V For compound (3) Iiprepareasolution of naptha, carbon disulphide, and-pooelemtor V A, in the same proportions aswith tlie f solution for compound A. r I For compound (4) I prepare a solution of; P n

the same groportions as -with the solution i compoun (1). 7 1 9,. In solutions'ior com nude 1, 2, 3 and 4,

naptha may be repl inwhole or'm pert by. carbon tetrachloride, benzole, 801* vents or acetone. The use of the carbon tetrachloride would reduce the huardl and permit using a smaller quantity of bondisulphide but seam was be kept sufiiciently hi hyin. volume completely 3 dissolve the su phuri n thesolution for compounds 1 'andQ-4,and'to have a dissolving 1 action on the-sulphur when'incorporated in the compounds, as in compounds 2 and 3.

a I qThe articles or product made h-om com- :pounds 1, 2, 3'and4 then are treated by immersingin the designated solutions, or in case of sheet orfiatarticles, are placed on a' saturated belt for a'sufiicientlengthuoi time for the solution to penetrate, usually from r' being "-1 tioncan be efi'ected in from 20 to 40 minutes,

. at'a' temperature not exceedin 212 E,-

and can biz-accomplished in 'a on ger time at-roomtemperature, What I claim is: 1

1-. The method of vulcanizing a rubber compound or article containing rubber and' a a metallic oxide, which consists in sub ecting said compound or article to-the action of a solution such as naptha, to which has been added carbon disulphide and an accelerator of class A as described, the necessary sulphur and an accelerator of class f B as de- 1 scribed being added to the compound or solution as may be desired, and finally vulcan- 'izing.

1: solution such as naptha, to'which has "been added carbon disulphide and an accelerator 2. The method of vulcanizinga'rubbr "compound or article containing rubbers-rid a I metallic oxide, which'consists 1n subgectmg said compound or article to the 'action of a of class A as described, the necessary sulphurand an accelerator of class B as described being added to the compound or so- Wlution as may be desired, and finally completing vulcanization by allowing the compound or article thoroughly to dry.

The. method of vulcanizing a rubbercompound or article-containing rubber and a metallic oxide, whichconsists in subject ing said compound or article to the action of h a solution suclias 'na tha-, to which-has been added carbon disulp of class Af iajs described, the necessary sul i: phur and an accelerator of class B as deiscribe'd being added to the compound or solution as may be desired," and finally com- ,lpleting'vulcanization by'allowing the compound o'r-article thoroughly. to dry,and then exposing to the action of heat.

Y 4. The method of vulcanizing'arubber compound or article containing rubber and a metallic oxide, which consists in subjecting said compound or article to the action of a solution such as naptha, to which has been added carbon disulphide, sulphur, an' accelerator of class A as described, and an acamine which with the carbon disul 6. The method of vulcanizing a rubber,"

a metallic oxide, which consists m subjecting},

added carbon disulphide, sulphur, an wi h;

metallic oxide, which compound or article containin erator of class A' as d celerator of class B as d ide and an accelerator v,

-metallie ox'i'deand sulphur, whic sub1ect1ng' said-compound or article to the action of a'solution such as na 7 has been added carbon disul do, an acccl- 'erator ofclass A as descri pound or article so treated celerator of classfB as at final] completing vulcanization ofth-e' Q0137 rubber "f compound or article containing rubber and a metallic oxide, which consists in subjecting saidcompound or article to the action of a solution such as naptha, to which has been; 3 added carbon disulphide, sulphur, an accelerator of class fli as described and an hide will, forma reaction product or an'acce orator of class Aas described, and final] completing vulcanization oi the compoun or article, 80 treated.

' 5. The-method of vulcanizing ia co'mpou'ndor article contai i rubber said compound or article to the action of a; solution such as naptha, to which has been erator of class A as described, and an ac-S-fl celeratorr of class Baas described, for a suflicient length of time for'the solutiori'; thoroughly to penetrate the compound or :rticle, and finally completing vulcanimh- 1- 7. The method of vulcanizing a rubber compound or article containing rubber ends consists in subjecting 5* V sa d compound or article to the action of a jf solution such as naptha, to which has been.- added carbondisulphide, sulphur, anaccele Y erator of class A as described, and anacmo celerator of class B as described, and I finally completing vulcanizationby allowing thelcompound or article thoroughly to 1' 8. The method "of vulcanizing. a rubber rubber and a metallic oxide, which consists, in subjecting said compound or article to thenction .of a

solution such as naptha, to which has been i added carbon disulphide, sul bur, an ace escri ,'and ariac-X ascribed, andlinally completing vulcanization by allowmg the compound or article first thoroughly to (tlhry, and-then exposingto the action of. [3;

ea 2 I 9; The 'methodof vulcanizing a'rubber compound or article containin rubbel-{a 1 consists in the, to which ed, and an accelerator of class B as described, and

finally completing vulcanization of the com- 10. The method of vulcanizing a rubber.,,

compound or article containin' rubber, a metallic oxide and sulphur, .whic consists in subjecting said compound or article to the action of a solution such as no the, to which has been added carbon disulp do, an acoelin subjecting said comppund'or article tothe fn'unw eratorof. class.B. as describdfjhid an f :amine which-with the carbon disulphide will Y form a reaction product o'r-classh orator asdescribed, and finally completing I vulcanization of thecompou'nd or article so ,1 treated.

1 1. The method of vulcanizing' a compound or article containin' rubber, a

metallic oxide and'sulphur, whic consists in v subjecting Isa-id compound or articleto the I 1 action ofafsolution such as na the, to which V has been added carbon disul do, an accel orator of-class A as descri d, and an accelerator of; class .B as described, for a *suflidien-t length" of time for the solution thoroughly to penetrate the compound or article, and finally completing vulcanization;

12. The method of vulcanizing a rubber compound or article. containing rubber, a

metallic'oxide'and sulphur, which consists in subjecting saidcompound orarticlc to the action of a solution such as nap-Elia, to do, an

which has been added carbon disul accelerator otclass A as descri "d, and an accelerator of class B, as described,

and finally completing vulcanization by aland fi'nally completingvulcanization by allowing the. compound or articlefirst thoroughlv to dry, and then exposing to the action of heat.

14. The method of yulcanizing a rubber compound. or'article containing rubber, a metallic oxide, sulphur and an accelerator of class B as described, which consists in subjecting said compound or article to the action-of a solution such as naptha, to which.

I ints-been: added carbon disulphide, and an accelerator of class A as described, and

6 0 f finally completing vulcanization of the compound or article so treated.

15; The method of vulcamzing a rubber V v a compound or article containing rubber,a

metallic oxide, sulphur and an accelerator of classfB as described, which consists action of a solution such as naptha, to which Y has been added carbon disulphide and an amine which with the carbon disulphide will A accelform' a reaction product or class erator as described, andfinally completing vulcanization of the compound or article so treated.

16-. The 1 method of vulcanizing a rubber compound or article containing rubber, a metallic oxide, sulphur, and an accelerator action oflasolution such as naptha,"to which has been added carbon disulphide and an accelerator of class A as described, for a? sufiicient length of time for the solut1on thoroughly to penetrate the compound or orly completing vulcanization.

ticle, and'fina 17, The method ofvulcanizing a rubber compound or article containing rubber, a metallic oxide, sulphur and an accelerator of class f B as described, which consists in subjectingv sa d compound or article to the action of a solution such as naptha, to which has been added carbon disulghi dcfidjgt escrl an accelerator of. class .A as finall completing, vulcanization, by. allowing t e compound or article thoroughly 18. The method of vulcanizing arubber compound 02'. article containing rubber, s metallic oxide, sulphur and an accelerator.

of class B as described, which consists in subjecting said compound or article to the action of a solution-such as'naptha, to which has been added carbondisul hide, and an accelerator of class A. as ascribed, and

finally completing vulcanization by allow ing the compound 'or article first thoroughly to dry, and then exposing to the action of heat. 19. The method of vulcanizing a rublzier compound or article containing rubber, ametallic oxide, an acceleratorof class A as described, and an accelerator of class B as described, which consistsin subject; ing said compound or article to the action of a solution such as naptha, to which has been addedcarbon disulphide nd. sulphur and finally completing vulcanization of the compound or article so treated.

20. The method of'vulcanizing-a rubber compound or article containing rubber, a

metallic oxide, an accelerator of class A.

as described, and an accelerator of class B as described, which consists in subject.-

ing said compound or article to the action of a solution such as naptha, to which has been added carbon disul hide and sulphur,

for a sufiici'ent length 0 time for the solu tion thoroughly to penetrate .the compound.

or article, and finally completin'gyulcanization.

compound or article containing rubber, a

metallic oxide, an accelerator of class A as described, and an. accelerator of clamy B. as described, which consists in subject. ing said compound or articleto the action of a solution such as naptha,to which has.

21. The method of winning"; mum

been added carbon disulphide and sulphur,

and finally. completing vulcanization by :1-

lovzling the compound or article thoroughl to ry. y The method of a rubber il: I 1,051, if"

urQa'n'gi finally completing corh oound or artiole oonta" r 3 h metallic oxide, an accelerator 0 class A y Tallowmg th com and or article ,fi tsb l I as described, and an accelerator of class thoroughly to B9 as o'iescribgd', which'consists in suban that etpoingtofiyi @Q;

wherbof-I .horeunto my; moms w.

action of heat.

In testmony 

